What a pity.Ernst Heinkel is a pioneer of the air age.
He 176,first aircraft to be propelled solely by a liquid_fueled rocket
He 178,first aircraft to fly under turbojet power, and the first practical jet aircraft
He 280,first turbojet-powered fighter aircraft
etc
Fred David,an Austrian Jew,worked for Heinkel in pre-Nazi Germany, as well as Mitsubishi and Aichi Kokuki in Japan. His design contributions in Japan resulted in the Mitsubishi A5M Claude fighter and the Aichi D3A Type 99 Val dive-bomber.Japan purchased He 112 and He 100,Ki-61 was also influenced by He 100.He 100 was also sold to Russian,Heinkel met Alexander Yakovlev when Russian bought He 100,maybe influenced Yak fighters too.
The Heinkel HD 37 was a fighter aircraft, designed in Germany in the late 1920s, but produced in the USSR as Polikarpov I-7 for Soviet Air Force service.
He 112 V5 didn't go to Sapin,V6 and V9 did.
Wow,you are Spanish!Sadly it seems that no He 112 survived.Spain used He 112 until 1952,maybe there is a surviving He 112?